Multi-focus physiologic sensing device for condensing light
A multi-focus physiologic sensing device for condensing light is disclosed, comprises a multi-focus condenser has one first ellipse reflection member, and one second ellipse reflection member is arranged at an end of the first ellipse reflection member. The first ellipse reflection member has a first focus point thereon. The second ellipse reflection member has two second focus points thereon. A boundary between the first ellipse reflection member and the second ellipse reflection member has a first confocal point. Two lighting elements are respectively arranged on the two second focus points to generate light sources, that focus light on the first confocal point through the second ellipse reflection member, and then the detected object reflects the detected light source back to the first confocal point. Then, the detected light source is passes through the sensor from the first focus.
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Field of the Invention
The present invention relates to a physiologic detection device, particularly to a multi-focus physiologic sensing device for efficiently condensing light.
Description of the Related Art
With technological advancements, in recent years the development of wearable physiologic detection devices is more and more popular, such as physiologic sensing watches. An optical detection method is generally used in the traditional technology. A lighting element is used to generate a light source which is incident on a detected skin, and then the method senses the optical signals reflected by the skin. The method analyzes the intensity variation of the light with different wavelengths after penetrating physiologic tissue, and uses the variation to figure out physiologic values such as heart rates, blood oxygen, and blood sugar. However, if the intensity of the light source is insufficient, the light source is easily affected by noise of environment light without penetrating the skin and the physiologic tissue. As a result, the physiologic values will not be precisely measured.
In order to increase the condensing efficiency of light, a condenser is added to increase the intensity of light, thereby increasing a signal to noise (S/N) ratio. The condenser used in the prior techniques has a small light-collection angle, such as a Fresnel lens, whereby the condensing efficiency is not improved efficiently. Besides, when heart rates, blood oxygen, and blood sugar are measured, the light sources with different wavelengths are used. If the condenser with one focus is merely used, the light sources with different wavelengths cannot simultaneously be analyzed, which leads to measuring an imprecise physiologic state.
Take a U.S. Pat. No. 5,995,856 for example. Refer to
To overcome the abovementioned problems, the present invention provides a multi-focus physiologic sensing device for condensing light, so as to solve the afore-mentioned problems of the prior art.
SUMMARY OF THE INVENTIONA primary objective of the present invention is to provide a multi-focus physiologic sensing device for condensing light, which efficiently increases light-condensing intensity and a light-collection angle, and which simultaneously uses the light sources with different wavelengths to focus on a detected skin due to several incident light focuses, and which utilizes variation of intensity of the light penetrating the skin to detect various physiologic signals.
Another objective of the present invention is to provide a multi-focus physiologic sensing device for condensing light, which increases productivity and light-condensing efficiency greatly.
To achieve the abovementioned objectives, the present invention provides a multi-focus physiologic sensing device for condensing light, which comprises at least two lighting elements, and each lighting element generates a light source. At least one multi-focus condenser has at least one first ellipse reflection member and at least one second ellipse reflection member. The second ellipse reflection member is arranged at an end of the first ellipse reflection member. The first ellipse reflection member has a first transparent plane and a first focus point thereon. A sensor is arranged on the first focus point. A boundary between the first ellipse reflection member being confocal with the second ellipse reflection member has a first confocal point, and a detected object is arranged on the first confocal point. The second ellipse reflection member has a second transparent plane and at least two second focus points thereon. The two lighting elements are respectively arranged on the two second focus points to generate the two light sources. The two light sources focus light on the first confocal point through the second ellipse reflection member whereby the light is incident on the detected object to form a detected light source, and then the detected object reflects the detected light source back to the first confocal point. Then, after the detected light source is reflected by the first ellipse reflection member, the detected light source is passes through the sensor from the first focus point, so as to detect a physiologic state.
Below, the embodiments are described in detail in cooperation with the drawings to make easily understood the technical contents, characteristics and accomplishments of the present invention.
Refer to
Besides, refer to
Then, refer to
In addition to the abovementioned embodiment, the multi-focus physiologic sensing device 1 for condensing light of the present invention is shown
Then, refer to
Then, refer to
In conclusion, the present invention possesses a simple structure to greatly improve productivity light-condensing efficiency, efficiently increases light-condensing intensity and a light-collection angle, simultaneously uses the light sources with different wavelengths to focus on a detected skin due to several incident light focuses, and utilizes variation of intensity of the light penetrating the skin to detect various physiologic signals.
The embodiments described above are only to exemplify the present invention but not to limit the scope of the present invention. Therefore, any equivalent modification or variation according to the shapes, structures, features, or spirit disclosed by the present invention is to be also included within the scope of the present invention.
Claims
1. A multi-focus physiologic sensing device for condensing light comprising:
- at least two lighting elements each generating a light source;
- at least one multi-focus condenser having at least one first ellipse reflection member and at least one second ellipse reflection member, and said second ellipse reflection member is arranged at an end of said first ellipse reflection member, and said first ellipse reflection member has a first transparent plane and a first focus point thereon, and said second ellipse reflection member has a second transparent plane and at least two second focus points thereon, and a boundary between said first ellipse reflection member and said second ellipse reflection member has a first confocal point, and said two lighting elements are respectively arranged on said two second focus points to generate said two light sources, and said two light sources focus light on said first confocal point through said second ellipse reflection member whereby said light is incident on a detected object to form a detected light source, and then said detected object reflects said detected light source back to said first confocal point whereby said detected light source is emitted exit from said first focus point after reflection; and
- at least one sensor arranged on said first focus point of said multi-focus condenser and receiving said detected light source to detect a physiologic state.
2. The multi-focus physiologic sensing device for condensing light of claim 1, wherein said second ellipse reflection member of said multi-focus condenser further comprises two first ellipse reflection parts, and an end of each of said first ellipse reflection parts has one of said second focus points.
3. The multi-focus physiologic sensing device for condensing light of claim 1, wherein said first ellipse reflection member and said second ellipse reflection member are integrally formed.
4. The multi-focus physiologic sensing device for condensing light of claim 1, wherein said detected object is arranged on said first confocal point.
5. The multi-focus physiologic sensing device for condensing light of claim 1, wherein said second ellipse reflection member is tilted upward with respect to said first ellipse reflection member.
6. The multi-focus physiologic sensing device for condensing light of claim 5, wherein said second ellipse reflection member is inclined at an angle of 1˜15 degrees.
7. The multi-focus physiologic sensing device for condensing light of claim 1, wherein said second ellipse reflection member further comprises two first ellipse reflection parts and a second ellipse reflection part, and each of said first ellipse reflection parts has said second transparent plane and one of said second focus points thereon, and said second ellipse reflection part has a third transparent plane and a second confocal point, and said second ellipse reflection part is arranged at an end of said first ellipse reflection member, and said two first ellipse reflection parts are inversely arranged on said second ellipse reflection part to connect said second transparent planes with said third transparent plane, and said second focus points respectively receive said light sources to pass said light sources into said first ellipse reflection parts, and then said first ellipse reflection parts focus said light sources on said second confocal point, and then reflect said light sources to said first ellipse reflection member, and said light sources are passes through said detected object from said first confocal point.
8. The multi-focus physiologic sensing device for condensing light of claim 7, wherein a curved surface of each of said first ellipse reflection parts is identical to a curved surface of said second ellipse reflection part.
9. The multi-focus physiologic sensing device for condensing light of claim 2, wherein said lighting elements are arranged on said two second focus points of said second ellipse reflection member.
10. The multi-focus physiologic sensing device for condensing light of claim 7, wherein said lighting elements are arranged on said two second focus points of said second ellipse reflection member.
11. The multi-focus physiologic sensing device for condensing light of claim 1, wherein said lighting elements are red light lighting elements, green light lighting elements, or infrared light lighting elements.
12. The multi-focus physiologic sensing device for condensing light of claim 1, wherein said lighting elements are light emitting diodes (LEDs), surface-mounted-device light-emitting diodes (SMD LEDs), or laser diodes (LDs).
13. The multi-focus physiologic sensing device for condensing light of claim 1, further comprising a casing encasing said lighting elements, said multi-focus condenser and said sensor and exposing said first confocal point.
14. The multi-focus physiologic sensing device for condensing light of claim 11, wherein said infrared light lighting elements emit light having a wavelength of 1000 nm˜1700 nm, and said green light lighting elements emit light having a wavelength of 500 nm˜560 nm, and said red light lighting elements emit light having a wavelength of 600 nm˜700 nm or 900 nm˜1000 nm.
15. The multi-focus physiologic sensing device for condensing light of claim 11, wherein said infrared light lighting elements are used to measure blood sugar, and said green light lighting elements are used to measure a heart rate, and said red light lighting elements are used to measure blood oxygen.
5995856 | November 30, 1999 | Mannheimer et al. |
6819687 | November 16, 2004 | Fein |
20090018452 | January 15, 2009 | Sugiura |
20160097511 | April 7, 2016 | Catalano |
Type: Grant
Filed: Dec 17, 2015
Date of Patent: May 29, 2018
Patent Publication Number: 20170172422
Assignee: Automotive Research & Test Center (Changhua County)
Inventors: Shun-Wen Cheng (Changhua County), Chun-Yao Shih (Changhua County), Jih-Tao Hsu (Changhua County)
Primary Examiner: Luke D Ratcliffe
Application Number: 14/972,691
International Classification: A61B 5/02 (20060101); A61B 5/0205 (20060101); H05B 37/02 (20060101); A61B 5/1455 (20060101); A61B 5/145 (20060101); A61B 5/00 (20060101); A61B 5/024 (20060101);